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The Next Generation Access Networks (NGAN) are the new step forward to deliver broadband services and to facilitate the integration of different technologies. The real challenge faced by 10GEPON new standard IEEE 803.3av is to upgrade the channel capacity for both upstream and downstream channels gracefully, while maintaining the logical layer intact ensuring the coexistence with legacy 1 Gb/s (IEEE...
Optical packet switching is an emerging technology, which provides enormous bandwidth for Internet traffic. In this paper, we investigate the performance of hybrid buffering optical packet switch with fixed-length packets under self-similar Pareto traffic, for a more realistic traffic. The performance is evaluated in terms of packet loss rate and average delay by means of simulation experiments. Usually,...
We elaborate on the theoretical foundation and practical application of the contract-based specification method originally developed in the Integrated Project SPEEDS, for two key use cases in embedded systems design. We demonstrate how formal contract-based component specifications for functional, safety, and real-time aspects of components can be expressed using the pattern-based requirement specification...
Switch fabrics for 100 Gigabit Ethernet systems pose high demands in terms of delay and scalability. In this paper we analyze the performance of a Clos-based switch fabric under uniform and bursty traffic, and compare its performance to a crossbar-based switch design for benchmarking. In particular, we focus on a Clos-design using a Space-Memory-Memory (SMM) configuration, which has recently gained...
This paper proposes the combination of the so-called lightpath bundling (LB) and anycast switching techniques, as a simple and effective option to increase the performances of multilayer optical networks. LB means that the lightpaths between two nodes are treated as a single connection of aggregated capacity. Anycast switching is proposed for implementing a per-packet-granularity balancing of the...
Designing multi-processor systems-on-chips becomes increasingly complex, as more applications with realtime requirements execute in parallel. System resources, such as memories, are shared between applications to reduce cost, causing their timing behavior to become inter-dependent. Using conventional simulation-based verification, this requires all concurrently executing applications to be verified...
Improving the interaction experience between humans and computers is a major research challenge and one of the most promising new modes of Human Computer Interaction (HCI) is via haptic devices which provide users with the sense of touch while interacting with computer systems. Two or more users may interact with each other and exchange the sense of touch by using Distributed Haptic Virtual Environments...
A detailed circuit assessment of Tunneling Field Effect Transistors (TFET) versus MOSFET operating near device threshold supply voltage, including the consideration of process variations, is reported. The analysis incorporates simulated 20nm TFET and MOSFET device characteristics combined with detailed circuit simulation. For very low power logic applications requiring near device threshold supply...
In current vehicles, a large number of control units are connected by several automotive specific communication buses, facilitating innovative distributed applications. At the same time, computers and entertainment devices use IP and commodity communications technology like Ethernet to connect to the Internet, allowing for innovative solutions and maintaining fast innovation cycles. Today, one can...
This paper presents a simulation toolset for estimating the impact of Trusted Platform Modules (TPMs) on the performance of applications that use TPM services, especially in multi-core environments. The proposed toolset, consisting of an integrated CPU/TPM simulator and a set of micro-benchmarks that exercise the major TPM services, can be used to analyze and optimize the performance of TPM-based...
In this paper a time reversal (TR) system combined with multiple-input single output (MISO) antennas over ultra-wideband (UWB) channels are experimentally investigated. An analysis on the spatial and temporal properties of the MISO-TR is presented in the special case of an in-car environment. As the TR can benefit from rich scattering environment, the application of the TR in the in-car environment...
This paper presents the results of an investigation into the effect of using co-axial cables in ultra-wideband off-body radio channel characterisation and performance evaluation for wearable antennas. Experiments were carefully designed to faithfully compare the use of a co-axial feed cable for a wearable antenna versus an optic fibre feed, and thus report on any errors introduced into the measurements...
The development of MIMO over-the-air (OTA) test methodology is an ongoing activity in 3GPP RAN4, CTIA and EU COST Action 2100. In this paper, the focus is on the anechoic chamber approach, which uses a uniform circular array of probe antennas to replicate directional channels for the device-under-test at the array center. In particular, we study in simulation the complexity requirements of implementing...
With the never ending quest for high performance and cost/power efficient processor design in recent years, how to provide performance on adequate hardware and power budgets has become an important issue. In this paper, we review and evaluate several variable length history branch predictors for high performance processors and propose a modified branch predictor, f-TAGE, to improve critical path delay...
In this paper, we analyze the impact of configuration time on network performance in GMPLS based WDM networks, and propose a modified destination-initiated reservation (M-DIR) approach to reduce the impact.
This paper demonstrates a File delivery Protocol called as CCSDS File Delivery Protocol (CFDP). CFDP is a Consultative Committee for Space Data System (CCSDS) Protocol. It is applicable for use in data transfer from Onboard Space Craft to Ground Station and Vice Versa. First part of paper talks about necessity of specialized protocol like CFDP followed by futures of CFDP. Design of CFDP is explained...
Movement of nodes in MANET makes the role of routing protocols tremendously important. Ad-hoc On Demand Distance Vector algorithm is a quick and efficient routing protocol for reduced broadcast. The dynamic and mobile nature of these networks faces frequent link failures resulting into broken routes. If the originating node is irresponsible to reinitiate route discovery, routing overhead may significantly...
Mobile networks can be formed in bus, train, aircrafts, satellites with a wide variety of on-board IP-enable devices and Network Mobility (NEMO) protocols are required to support uninterrupted services to ongoing sessions. Node mobility has a direct impact on the performance evaluation of various NEMO protocols. However, most of the analysis on mobility protocols used random waypoint mobility model...
In this paper, we present a performance evaluation for six scheduling algorithms over a MIMO-OFDM based cellular system. We have selected a set of scheduling algorithms that may use information about the instantaneous channel conditions, status of transmission queues, QoS requirements or pending HARQ retransmissions. Performance evaluation is focused on average delay under different cell load conditions,...
A significant challenge in wireless sensor networks is the transmission of data from a large number of nodes to a central collection point. This is commonly called converge-cast communication. At present, the IEEE 802.15.4 and ZigBee standards are widely used in the design of wireless sensor networks. The latter standard defines a methodology for converge-cast communication in tree-based network topologies...
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